Abstract：
:Opioid receptors which are involved in cough generation are abundantly expressed in the brainstem. Codeine is a potent μ-opioid receptor agonist. In the present study we examined the effects of naloxone, a μ-opioid receptor antagonist, on mechanically-induced tracheobronchial cough and on the cough suppressing effect of codeine in six pentobarbitone anesthetized spontaneously breathing rabbits. A single dose of naloxone (0.4 mg/kg) followed by a single dose of codeine (7 mg/kg) were administered intravenously. The number and amplitude of cough and sneeze reflexes were examined sequentially; before and after naloxone, and then after codeine. We found that neither did naloxone alone nor codeine given after prior naloxone pretreatment appreciably affect coughing or sneezing. Likewise, there were no significant differences in the diaphragm and abdominal muscles electromyographic moving averages, or the inspiratory and expiratory esophageal pressure amplitudes. However, we detected a tendency for the rise in expiratory motor drive during coughing and sneezing after injection of naloxone. The respiratory rate was significantly higher after naloxone in comparison with control (P < 0.001). No significant differences in arterial blood pressure were observed. We conclude that the failure of codeine to suppress the cough reflex on the background of naloxone pretreatment confirms the involvement of μ-opioid mechanism in the central antitussive effect of codeine.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Simera M,Veternik M,Poliacek Idoi
10.1007/978-94-007-4549-0_9subject
Has Abstractpub_date
2013-01-01 00:00:00pages
65-71eissn
0065-2598issn
2214-8019journal_volume
756pub_type
杂志文章abstract：:The phylum Cnidariais one of the earliest branches in the animal tree of life providing crucial insights into the early evolution of immunity. The diversity in cnidarian life histories and habitats raises several important issues relating to immunity. First, in the absence of specific immune cells, cnidarians must hav...
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journal_title：Advances in experimental medicine and biology
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abstract：:Cognitive-behavioral therapy (CBT) is the main method of psychotherapy generally accepted in the field of substance addiction and non-substance addiction. This chapter mainly introduces the methods and technology of cognitive-behavior therapy of substance addiction, especially in order to prevent relapse. In the cogni...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
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更新日期：2017-01-01 00:00:00
